Qingyun ran all the way to the hut where he lived, and saw Uncle Chen's son Wenzan cleaning the courtyard from a distance, so he couldn't wait to shout,

"Brother Wenzan, can Uncle Chen be in the house?"

Chen Wenzan looked up and saw that it was Qingyun, and smiled honestly,

"Brother Yun, you're late. A little girl just came to find her father. Daddy hastily packed up some things and went out. ”

Qingyun still didn't believe it, and rushed into the house in one go.

Seeing that Uncle Chen was really not there, he had to turn around and go out and said stupidly, "Could it be that Uncle Chen didn't leave anything for me?" ”

"This ...... There should be some instructions, you can ask that little girl. She, she seems to be looking for you. Oops~", Chen Wenzan was talking to Qingyun at the door of the house, and he couldn't help but scream when he was slapped on the shoulder.

I saw a pair of beautiful eyes behind her looking at her with a smile, "Who are you shouting little girl?" ”

Chen Wenzan smirked and pointed to the Gourd Cai Pavilion, and looked at Qingyun, "That's it, it's her." ”

Gu Caiting looked Chen Wenzan up and down, and his face was quite surprised, "You don't know martial arts?" ”

"I have a strong body, and my dad said I don't have to use my fists and feet to strengthen my body. I hired a gentleman, saying that he wanted to make up for my brain. Chen Wenzan said it lightly, as if he didn't care about whether he practiced martial arts.

Most of this optimistic temperament is blessed by God, but it often makes others quite speechless.

Gu Caiting shook his head helplessly, "If you haven't learned swords from Uncle Chen, don't go to Luojing with us." ”

"Luo Jing? Are you going to take Brother Yun with you to Luojing? ”

Qingyun walked up to Chen Wenzan and shook his shoulder vigorously, "Yes, I'll go to Luojing to find Uncle Chen, I'll trouble you here." ”

"But dad doesn't mean he won't go back to the north......"

Gu Caiting sighed and interrupted angrily, "Uncle Chen really never told you about his teacher's origin?" ”

Chen Wenzan shook his head like a rattle.

Qingyun also looked innocent, "Uncle Chen never mentioned his mentorship, but only briefly introduced the reason for passing on my swordsmanship. He said that the ancestor of our Qing family was the first assassin Qing Ke in the Eastern Zhou Dynasty, and he was famous for generations, and his inheritance could not be broken. I don't know anything else. ”

Gu Caiting shook his head, "It's okay, it's okay." Let me tell you. ”

After saying this, she suddenly turned positive, and the playful expression when she was pranking with Chen Wenzan just now instantly melted into a solemn and righteous face.

"There are five sword sects in the world, one of which is the Tan Sect, and the successive heads are called Tan Jun.

The last Tan Jun was Qing Yihan, the father of Senior Brother Qing.

Eighteen years ago, Qing Shibo assassinated the young emperor Tuoba Hong of the Northern Wei Dynasty and the regent Empress Dowager Feng in Pingcheng.

At that time, he was captured by the first master of the Inner Court of the Northern Wei Dynasty, and Uncle Gai Kun, who was also out of the same family.

Uncle Qing fought to the death in order to protect the righteous men who were other conspirators.

This gate was implicated in this case and was almost destroyed.

Fortunately, my master hid by Emperor Wei's side for many years, secretly protecting Uncle Chen Daoju and fleeing to Southern Qi, but also warned him not to pass on martial arts anymore and not to return to Wei soil.

This is probably the reason why Uncle Chen has never confided in you about the past.

Because of this, my Tanzong sect has been hidden in the rivers and lakes for more than ten years, and I have never established a Tanjun again.

But in recent years, those who have been secretly sheltered have gradually become wings.

The country cannot be without a king for a day, the family cannot be without an owner for a day, and there is also a wish to establish a new head in the door.

This time, Master specially asked Uncle Chen to preside over the overall situation.

The agreement not to return to Wei Tu will naturally no longer be counted.

Since Senior Brother Qing followed Uncle Shi to learn swords, he could naturally go together.

Although I only exchanged one move with Senior Brother Qing today, I found that Senior Brother didn't seem to practice this move.

But among them, the sword intent is lingering, the charm is extraordinary, and there has been a small success in the way of the sword.

If you can learn more from the door this time, the future is limitless. ”

Qingyun was overjoyed when he heard this, and slapped his right hand heavily on Chen Wenzan's shoulder, "Great, I can finally go out for a walk." Uncle Chen had never mentioned my father before, and if he could meet someone from the sect this time, he would have to talk about it. Senior sister, since it is a grand event in this family, there should be no problem for Brother Wenzan to walk with us, right? ”

Chen Wenzan shook his head like a rattle, he took out a scroll and said with a bitter face, "Before my father left, I asked me to listen to Mr. Zu for everything." If the questions in this sutra are not finished and have been reviewed by the husband, you must not leave home. Do you know your father's temper, so disobedient, I'm afraid that he will break his leg? ”

Qingyun pursed his lips, barely recognized, picked up the sutra and flipped a few pages, only to see the hair standing upright all over his body, "This, what kind of ghost is this?" So he picked up the scroll and pulled Chen Wenzan away.

"Brother Yun, what does this mean?"

"Help you find someone to solve the problem! What else should I do? Let you spend your whole life here? In Qingyun's laughter, Chen Wenzan and Gu Caiting also reluctantly followed.

There is a west peak outside the ditch, and the west is only ten miles away, and the mountain is not more than a hundred zhang high.

But if it is said that walking from this point to the top, for people like Qingyun and Gu Caiting who practice martial arts, they don't feel anything, but they pity Chen Wenzan and suffers with it.

When they reached the middle of the mountain, the two saw the latter's embarrassment and looked at each other.

So one person and one arm set up Chen Wenzan, let him call all the way, and then rushed to the top of the mountain before sunset.

Strange stones and strange trees, the sunset is red, and a two-story small pavilion with vermilion lacquer stands in the middle.

Qingyun didn't knock on the door, but shouted loudly, "Yuzhi, I'm here!" ”

I saw a sword shadow rushing out from the top layer, and the silver light melted into the twilight glow, perfectly hiding the context of the sword dragon.

Seeing this, Qingyun suddenly turned his back, undisturbed by the glow, listened to the wind to distinguish the position, and threw out a sword in his hand, and a cold light rose from the ground.

Gu Caiting secretly praised in his heart, this junior brother seems to do it casually, but it is secretly in line with the sword intent of the "Xunlan Five Rises" of the sect, which is refined and pure, without the slightest distraction.

People don't move their thoughts, the sword wind is self-generated, and the sword view of my life advances and retreats, without losing its way, which is the heart of the "wind and earth view".

The flying sword shadow seemed to be a self-projecting light curtain, and the advantage of the sword that had originally taken advantage of the time and place had been completely dissolved.

The momentum of the flying sword swooping, like an arrow off the string, suddenly swirled when the cold light rose.

The person who came seemed to have borrowed the power of Qingyun's sword, and the momentum of the fall suddenly slowed down, floating up like a cloud, and slowly falling.

I saw a few thunderbolts flashing out of the cloud shadow, the silver light went out a few times, and in a breath, five swords had been struck.

Qingyun twisted his body and swung his sword, the sword was like a spring breeze, and it was popular on the ground, although it seemed to be not strong, and the five cold rays were swept away between the swings.

The remnants of the sword intent were still stirring like the wind, as if they were about to blow away the clouds floating in the air.

The dragon is hidden in the clouds, and the dragon groans suddenly.

The sword qi of the coming person condensed on the line, spit out again, and the momentum skyrocketed, and the sword intent floating from the sky was exhausted at this time.

Qingyun's spring breeze at the bottom of the sword was shocked by this dragon chant, and he had to scatter in all directions, and he could no longer gather into a threat.

With three changes in this move, Gu Caiting frowned when he saw it, and secretly sweated for Qingyun.

Qingyun also knew the sharpness of this sword, so he didn't dare to take it hard, so he retreated a few steps to avoid its sharpness, and then turned around, and the horizontal sword fell straight down.

Although the momentum of the silver dragon was strong, the sword intent was exhausted, and at this time, it was suppressed by Qi Xiang, and the figure in the cloud also sank, knowing that the sword move had been broken and could no longer be done, so he picked up the long sword and settled down.

"I haven't seen you for a few days, and I've grown a lot! In your hands, I have never taken half of the advantage. I saw that the person who came was dressed in white, neat and tidy, with a long figure and fair skin, if it weren't for the green rainbow swaying in his hand, he would look like a scholar.

Gu Caiting slapped his palms aside and praised his junior brother, "This trick 'Thunder Sky Strong' is used wonderfully!" Master has always instructed that Lei Tian Dazhuang is a killer of his own sect, and he can't take it lightly, but he didn't expect that he could use it like this. Did Uncle Chen teach you this kind of change? ”

Qingyun snorted slightly, "Uncle Chen only taught me that where the sword is, it means first."

There are no moves in ancient swordsmanship, and the 'rise and fall method' of this door has been perfected in the period of the ancestor Qingke.

Later generations attached to the image of "Yi", and only then did they give birth to many changes.

These changes are intended to allow practitioners to practice makes perfect, and to naturally use their moves in actual combat, but if they don't know the principles of the sword, they are useless. ”

He obviously didn't want to dwell on this, so he stretched out his hand and pulled the man in white forward, "By the way, introduce a friend to you, Zu Yuzhi, Brother Wenzan's classmate." ”

"Classmates?"

Chen Wenzan grinned, "My teacher is the father of Xuanzhi, Mr. Zu Chongzhi. ”

Qingyun pointed to the gourd pavilion again, "Suddenly, this is mine...... Uh, senior sister, Gourd Caiting. ”

Hearing this, his eyebrows made a small movement that was not easy to detect, but he still hugged his fist at Gu Caiting, "This woman, I don't know what to call the commander?" ”

Before Gu Caiting could answer, Qingyun had already rushed to say, "Senior Sister Gu's master is sneaking in Wei Ting, so it is inconvenient to talk about it in detail. We came this time, mainly because we were afraid that you would be bored with stargazing alone, so let's have a good time. You, the Lord of the Stargazing Pavilion, won't you meet here? ”

Zu Yuzhi glanced at him, "When did you not come here to shout, and leave after a fight?" When are you in the mood to accompany me for stargazing? If you have something to say, just say it, go, go sit in first, don't say that I neglected the guests. ”

This stargazing pavilion was originally built by Zu Chongzhi, the father of Xuan Zhi.

Since Chongzhi served as a captain of Changshui, he had jurisdiction over the defense of Dantu and Guangling, and protected Jinling, so he had little leisure.

These things of observing the sky and measuring the stars, and supplementing the "Fixation Technique" basically fell on the shoulders of Xuan Zhi.

Although this attic is not large, it is a collection of strange and ingenious objects, which are of course created by the Zu father and son.

Among the several people, only the gourd pavilion was a newcomer, and as soon as he entered the door, he was shocked by the giant bell facing the door.

The bell is embedded in a niche at the far end, with a chicken's head sticking out in the middle, a large "unitary" character is revealed in the wooden lattice on the left, and a dial on the right slowly rotates with the passage of time.

Seeing that the hand was about to turn back to zero, a small bucket on the right wall suddenly overturned, and water fell like a waterfall on the stone platform below.

There was obviously a heat source under the stone platform, and the steam rose instantly, with a rich floral fragrance.

The head of the chicken made a few golden sounds, retracted into the niche, but replaced it with a dog's head and slowly poked out, and the word "unitary" in the left Mugeri was also changed to the word "戌" at this time.

Seeing that she could see it, Zu Yuzhi smiled and explained, "The core of this self-propelled clock is two vessels, that is, buckets like this.

As long as the amount of water injected is stable, the bucket will be tilted at regular intervals to empty the water inside.

The different weights of the bucket drive the dials on the wall.

This device in the room is used to control the scale change within an hour.

Its water source is taken from the water hose outside the house, and there is a drain balance to ensure a stable flow, and there are spices in the scale.

The water poured over the bluestone stove heats and humidifies the room, providing a source of incense.

The outdoor bucket is relatively large, repeated once a day, and is used to drive the dial of the hour.

The water source of the large bowl is mixed with some, uh, natural fertilizer, which can be used to irrigate the vegetable patch behind the attic when the water is released. ”

Gu Caiting was already dumbfounded at this time, and suddenly saw a bamboo arm holding four bowls of clear tea, firmly placed on the coffee table of the main seat, and was even more curious, "This, what's going on?" I didn't see you do anything, how did you conjure up four bowls of hot tea? ”

Zu Yuzhi smiled, "You see, that gate pivot will return to its position on its own. When we came in just now, everyone pushed it over. With each push, a cup of tea is pressed out of the water tank of the stone furnace. The weight of the tea will press the mechanism of this bamboo arm. As long as the hub is stable and no one is coming in or out, it will bring up the saucer. ”

Qingyun patted the stiff body of the gourd Caiting and winked at Xuanzhi, "Ancestor, why don't you take the guests to the second floor to view the treasure?" ”

"This ......" Zu Yuzhi suddenly looked embarrassed.

Seeing this, Gu Caiting obediently accompanied a smiling face, "Brother Xuanzhi, take the little girl up to open your eyes." The things here are expensive, so I naturally don't dare to touch them casually. If there is any damage, the little girl can't afford to pay for it. ”

Yu Zhi sighed, waved his hand, and said, "It's really something that can't be touched." Who made me friends with you fox friends? Let's go up and take a look. ”

He led everyone to a small cubicle in the corner, and as soon as he pulled the mechanism, a rope was pulled up, pulling up the entire compartment.

Gu Caiting was startled at first, and when he saw that the three people around him were all smiling and looking at him, he could only force his composure. But I secretly thought in my heart, I want to see the joke of this woman, then there is no way!

The lifting mechanism stopped on the second floor, and the gourd Caiting was afraid that there would be any more strangeness, so he hid behind Qingyun and poked his head out slipperily.

I saw an armillary sphere in the middle of the main pavilion.

The production process of the armillary sphere is complicated, except for the current Southern Qi and Northern Wei official Tianjian Division, it is really rare to see it in other places.

Although he was a layman in astrology, he still recognized at a glance that the rarest treasure on this floor was not the armillary sphere, and the huge device on the platform was probably the one that was unparalleled in the world.

So she raised her jade fingers lightly, "What's that?" ”

Zu Xuanzhi smiled bitterly, "You know the goods."

This Shundi Yuheng is also known as the Sky Mirror, because the material is difficult to find, the physical object has been lost for a long time.

However, its principle is recorded in the "Book of Ink", and the regulation is collected in the Eastern View.

Although Mozi understood the principle of magnification, distant vision, and imagery of speculum, he could not find transparent, carvable ore to make speculum.

When Mr. Huayang, the tutor, was looking for Danshi raw materials, he accidentally found a huge transparent gypsum crystal.

Gypsum is different from quartz and can be polished into shape.

It took my father and I more than ten years to polish a few qualified lenses and then seal the glaze with wax.

According to the ancient method recorded by Cai Yong of Dongguan Academy, the brace was used to fix the distal lens, and the sheepskin was blinded.

As long as the lenses we use for observation are properly adjusted, we can see thousands of miles away. Used to watch the moon, the mountains and seas are like. ”

The gourd pavilion caught a glimpse of the large mirror disc at the far end of the night dome that was several feet in diameter, and couldn't help but be secretly stunned.

Just such a large gypsum crystal can be regarded as a treasure in the world, let alone being made into such a magical device.

Of course, she naturally pestered her to help her adjust the mirror distance.

When the uneven surface of the moon appeared in front of her, the playful eyelashes flashed full of surprise, and the charm instantly overshadowed the starry sky.

"Oh my God, the moon is so big! I don't know where the Guanghan Palace is? ”

"It is said that the moon is made of seven types of ores, and there may be people living on it. It is said that there are regular Tiancha from Songshan to and from the earth and the moon. But it's hard to tell whether this is true or not. If I have the chance, I'd like to check it out too. ”

"Do you have to look at the stars here every day?"

"Yes, if the weather is good," he said, walking towards a astrolabe next to Yuheng, gazing at the sky, and after a while, he began to adjust the position of some markers on the astrolabe.

"Every day I have to record the position of the stars and the full phase of the moon, and every mark of this astrolabe is linked to a movable carved plate.

Not only here, but the wind strength collected by the wind hyacinth on this stage, and the date recorded by the self-clock below, are all connected to the letterpress module.

When I'm done recording the stars, I just spin the wheel, and it's like this.

A chart of the day with the date and weather will be printed. ”

As the roulette wheel turned, a long scroll with fresh ink spat out from under the astrolabe. "This letterpress rubbing was improved by my father based on the engraving plates used by the master printer. With these daily records, it is possible to proofread and deduce the Fixation. ”

Qingyun couldn't help but interject at this time, "What is "Embellishment"? I've always heard you talk to Uncle Zu, but I've never understood. ”

Zu Yuzhi frowned, "It's really difficult to explain."

For example, if there is a thing, we need to measure it if we want to perceive it accurately.

Usually we measure its length, width, and height to measure its size, that is, to modify and describe it with these three affixes.

But if this thing is not in sight, cast into the vast starry sky, we can't describe them with simple embellishments.

It is necessary to know more, such as rotation, trajectory, and the law of change, not only to measure its space, but also to its relationship with time.

These quantities that are constantly changing, they are used to perceive the universe of stars. ”

Qingyun shrugged his shoulders, looked at each other with Wen Zan, and spread his hands, "I don't understand!" ”

"I don't understand either." Wen Zan also smiled in return.

Zu Yuzhi sighed, "Yes, my father also said that no one will understand." So even if the book is written, it may not be long before it is lost. ”

Gourmet Caiting blinked his eyelashes with a timid expression, "Then why do you have to put so much effort into completing it?" ”

"What if someone could understand and continue to study?" At the mention of this, Tsukiyuki's face was full of anticipation and piety, "Then our world may be different." ”

He suddenly patted Qingyun on the shoulder, "Maybe I'll go to Wei once in the near future." ”

Hearing the word Wei Guo, Qingyun's heart moved, but his face did not show half of his color, and he asked in a deep voice, "Wei Guo?" What to do in Wei? ”

"My father said that our ancestor had a good seedling in the north, called Zu Ying. He loves books and is far more insightful than his peers. My father specifically asked me to go and see it. If you really have talent, you will focus on cultivating it. ”

Qingyun raised the corners of his eyebrows, and asked, "How about we go with you?" ”

Zu Yuzhi was very surprised when he heard this, and looked at Qingyun vigilantly, "You? I remember Uncle Chen saying......"

"Oh, some of the previous conventions have changed. Uncle Chen has already gone north before us. ”

Yu Zhi glanced at the Gourd Cai Pavilion and saw that the latter was flickering rhythmically, covering up all mood fluctuations.

He had to take a long breath and said to Qingyun, "Uncle Chen asked you to go with you?" ”

Qingyun shrugged his shoulders and suddenly looked to the north, his eyes full of expectation, "There is something important in the division, how can you be absent?" What's more, my father is the former head of the family, maybe this trip can also let me know more about my father's past. ”

Yu Zhi snorted, and Zhengse said, "If your father's matter was so simple, Uncle Chen would have told you a long time ago." Since he didn't say it directly, he wasn't ready for you to intervene in the Tan Sect's affairs. ”

"So you know the origin of Uncle Chen's sect, but you have been hiding it from me?" Qingyun's tone was a little annoyed.

He has been living a reclusive life with the Chen family, and Zu Yuzhi can be regarded as the best friend other than Chen Wenzan. Unexpectedly, he hid so much important information from himself.

Zu Yuzhi shook his head and looked at Qingyun sincerely, "Actually, I really don't know much more than you. That's why I don't dare to speak up. It's just that the fact that Tanzong was swept away in the Northern Wei Dynasty is not a secret, and I heard a little from my master. Brother Qing has never gone out to walk around, so he doesn't know. I can also understand your curiosity about your father and the sect at this time. I'm not trying to stop you from going north, but I think it's important to warn you that there may be a lot of unexpected complications. ”

Qingyun's heart was surging, and since he was ignited by the gourd pavilion with the idea of going north, he was ready to face any danger.

But he is not a reckless man, and since he has never traveled far, it is certainly beneficial for him to have multiple acquaintances to take care of him.

So not only did he not refute, but he also smiled again and again, "So, I have to ask Brother Yu for more guidance along the way." ”

Knowing that he was helpless, he could only reluctantly nodded, "Brother Wenzan is also going with him." ”

Qingyun saw him agree, and laughed, "This is natural!" It's just that Brother Wenzan still has some small troubles right now......"

》》》》》 time to knock on the blackboard《《《《《

Did there really be an astronomical telescope in ancient China?

If history is followed, the answer is yes.

"Shangshu Shundian": In Xuanji Yuheng, Qi Qizheng. Kong Shu: Ji, Heng, the king is an astronomical instrument.

This record shows that Xuanji and Yuheng are both astronomical observation equipment.

The Eastern Han Dynasty Confucian Cai Yong and others edited the "Dongguan Hanji", which is one of the best letter histories outside the official history, which has a very detailed description of Yuheng: Yuheng is eight feet long, with an aperture of one inch, and the lower end looks at it to see the stars. And the county (through the hanging, Xuan) Ji to like the sky, and to Heng Wang. Turn around to know the stars. It is eight feet in diameter, two feet and five inches in diameter and strong.

According to this description, Yuheng is a standard telescope. Turning Xuanji to locate the stars, and then using Yuheng to observe, is the scientific stargazing method of the ancients. We all know that telescopes, even astronomical telescopes, use the basic optical principles that are actually very simple. Even as early as the Spring and Autumn Period, there were relevant studies on the Mohists. But when theory translates into practice, the most important thing is often not design, but materials. At that time, there were very few materials suitable for polishing into convex and concave lenses. Crystals are not only precious, but they are also more difficult to process. The problem of glass will be mentioned later, in short, glass was rarer than jade in the Central Plains at that time. Clear plaster was probably the most suitable material for polishing lenses at that time, but the large pieces of transparent plaster were rare commodities, which was the main reason why telescopes could not be industrialized.

The same goes for movable type printing. The commercialization of movable type appeared in the Song Dynasty, but block printing was already widespread in the Northern and Southern Dynasties. From engraving to letterpressing, the difference is not theory, nor invention and improvement, but the supplier of movable type. Therefore, as long as there is engraving printing, replaceable letterpress is a feasible technology, but before there is no professional supplier, it can only be the private skill of some craftsmen.

To get back to the point, in this chapter the author mentions the ancient people's understanding of the rocky moon surface, is this consistent with historical facts? The answer is also yes, it's just not widely spread. The ancient Confucianism studied the classic avenues, and pondering these strange skills and tricks belonged to miscellaneous studies, which not only had limited influence, but also was difficult to find inheritance.

There is a theory about moon rocks among the people. It was first seen in Zhang Heng's "Lingxian". But the most accurate and detailed expression is still the Tang Dynasty miscellaneous "Youyang Miscellaneous" Moon Palace guest section, the man said: Jun knows that the moon is a combination of seven treasures? The moon is like a pill, its shadow, and the sun shines on its convex place.

This person said that the moon is made up of seven ores and is a spherical shape. The idea that we see the shadow of the moon, formed by the sun shining on an uneven surface, is almost infinitely close to reality. It is difficult to say that such a detailed explanation is based on imagination.

As for Tissot, which travels between the earth and the moon in Songshan, it is also from this book. Real geometry, full of you. Although the book was written in the Tang Dynasty, the subject matter is a compilation of stories, and not all of them are contemporary. This is only used to illustrate the ancient people's understanding of the rocky lunar surface.